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"How long should the party go? For the under-3 crowd, an hour is plenty. For 4- to 6-year-olds, two hours works well. Older children can enjoy a two-hour party, or a bit longer, provided there&#39;s plenty of varied entertainment. "
<https://answersmeta.com/455161-what-is-a-good-time-for-a-first-birthday-party>